Eugew beisz



Mar. 13, 1923. 1,448,676

E. REISZ RECEIVER Filed May 25, 1921 flrra ENE/s Patented Mar. 13, 1923.

lfittttiit EUGEN 165131525, 0]? EZEHLENLDOlEtF-llEITTE, GrlElltlllIAlHZ'.

Application filed May 25, 1921.

To all 2071mm, it may concern:

Be known that I, ltucnn litnrsz, a citizen oi the Republic of Hungary, and a resident of Zehlendort-Mitte, Germany, have invented a new and Improved Receiver (for which I have filed an application in (ten many January 14', 1920), of which the itch lowing is a full, clear, and exact description.

This invention relates to electrical receivers, and has particular reference to a magnetic receiver.

An object of the invention to provide a receiver in which the disposition of the mass of the armature oil the receiver is disposed so as to have a maximum sensibility for a given magnetic field.

Another object of the invention is to pro vide a receiver in which the vibrations of the diaphragm respond to the magnetic variations of the circuit with maximum elliciency and a minimum expenditure of magnetic energy.

A further object of the invention resides in the provision of the particular arrangement and construction of parts hereinafter described and claimed and shown in the ac companying drawing.

In the Working or an ordinary receiver, the efficiency or the operation depends upon the quantity 0t magnetic lines which pass through the transverse section of the LII1'IEL- ture, which, in the receivers now in use, is the membrane of the receiver. @rdinarily an increase in the sound power of the re ceiver can only be obtained by the enlargement of the transverse section of the armature, the magnetic saturation taking; into account the iron loss, being very limited. It the transverse section of the armature is increased however, the t'requency of vibration of the anchor becomes less and the response of the membrane becomes hollow and unnatural.

By my invention, I overcome these defects in that the size of the required magnetic section of the armature is kept small, although capable of carrying the maximum number of magnetic lines desired.

This purpose is further enhanced by the provision of a long length of armature compared to the width of the same, across which 7 the magnetic lines flow.

The invention 1s illustrated in the draw EECEI'VEJEt.

Serial No. 1,72,617.

mgr, which represents a perspective view of the receiver.

.llhe invention, as shown in the drawing, indicates that the armature is given an t. form, when considering; the transverse sec tion thereof, and tl'iat the proportionot the length of the armature to the width is very great, so that the size of the angle of the anchor is shortened as much as possible and, consequently, the frequency of vibration of the armature is increased.

By the use of an t. form for the armature and its particular position. as shown, the re sult is obtained that the transverse section through which substantially all the magnetic lines pass is in immediate proximhy oil the axis of vibration or": the armature. It will be :turther noted that the parts of the armature which are further away tromthe axis, and have a greater vibratory patlnhavc a smaller cross section, since the number of lines of force passing through these parts of the armature decrease the further the parts are from the axis of vibration.

By reason of the fact that the substantial part of the mass of he armature is centered near the axis of vibation, the moment of inertia of this anchor is decreased, so that the vibratory response to any magnetic variation is greatly increased.

it. working efample oi? the receiver is shown in the drawing in which the magnet e is made from thin sheets oi? any suitable material, such. steel or iron, and forms in transverse section a quadrangle which is open at the corner of one side. In this open space an armature is pivoted at points a near each end thereof. It will be noted that the transverse section or. this armature is in the term of the letter i... Between the pivot points 0 this armature is disposed in such a way that the .ilOllTldl positions of both sides of the armature are parallel with the adjacent ends of the magnetic poles. The axis of revolution of the armature is disposed substantially coincident with the line of incrsection of the two faces of the adja cent poles of the magnet.

The proportion of the length Z compared with the width or" the armature is taken as large as possible. it will be noted that the two sides or? the armature are short, since this armature has, by reason of the concenit h tration of mass above mentioned, the reuired mass density disposed in the line of t e most intense magnetic field to properly carr this field and at the same time have as high a rate of vibration as possible. The magnets a are energized by means of spools of wire d.

The vibrations of the armature b are communicated by means of a lever e to any suitable diaphragm f, which may be made from mica or other suitable material.

The construction of a receiver as above described is especially suitable for loudspeaking telephones and other devices in which an amplification of sound is desired, since in this case a greater vibration is transmitted to the diaphragm without the use of a larger magnet, by reason of the disposition of the mass of the armature in the manner above described.

What I claim is:

1. A receiver comprising a quadrangularshaped magnet having one corner portion cut away, and a pivoted armature having an L-shaped section disposed in such cutaway portion, the axis of rotation of the armature being disposed substantially coincident with the line of intersection of the two faces of the adjacent poles of the magnet.

2. A receiver, comprising a magnet having an L-shaped pivoted armature, both sides of which are normally parallel with the adjacent sides of the magnetic poles of said magnet, and the armature so positioned that the maximum lines of force passing therethrough occur adjacent its rotative axis.

A. receiver comprising a (piadrangula'rshaped magnet having a corner cut away to form adjacent pole faces, and an Lshaped pivoted armature disposed in said corner with its axis disposed substantially along the line of intersection of the two faces of the adjacent poles of the magnet, the substantial part of the mass of the armature being disposed along and immediately adjacent the axis thereof.

4. A magnet provided with a gap in its magnetic circuit extending transversely thereof, and an armature pivotally supported within said gap about a longitudinal axis the distance of which from the two faces of the gap is unequal.

5. A rectangular magnet provided in one corner with an angular recess extending the length of the magnet, and an elongated angular armature pivoted at its ends in the said recess, the faces of the armature being normally parallel with the walls of the recess.

6. A magnet provided with a gap having two faces or walls, an armature rotatably supported within said gap. the longitudinal axis of which is parallel to the walls of said gap and an unequal distance from the faces or walls thereof.

EUGEN REISZ. 

